Bug 15602: Accessibility: Can't tab to add link in patron card creator add patrons...

Bug 15602: Accessibility: Can't tab to add link in patron card creator add patrons popup

To Test -

1. Go onto Tools and then click on Patron Card Creator.
2. Click on New and then Card Batch.
3. Add a borrowernumber then add patron.
4. Search for a patron.
5. Using the tab key try to navigate onto the Add link.
6. Notice it skips Add.
7. Apply the patch and then repeat steps 1-5, notice the add link can now be
   accessed through using the keyboard.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as described.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com
(cherry picked from commit 7d08937033dfc99c584e6e4433c49b5ca66e21c4)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
(cherry picked from commit 0c4c2a9dd570320d610b48a264eade3e89429be0)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>